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%I #4 Mar 07 2016 12:30:28
%S 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,
%T 27,28,29,30,31,32,33,34,35,36,49,38,39,40,41,42,43,44,37,46,47,48,45,
%U 50,51,52,53,54,55,56,57,58,59,60,97,62,63,64,65,66,67,68,69,70,71,72,61,98,99,76,77,78,79,80,73,82,83,84,81
%N Permutation of natural numbers: a(n) = A269172(3*n) / 3.
%C The first non-fixed term is a(37)=49.
%H <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>
%F a(n) = A269172(3*n) / 3.
%o (Scheme) (define (A269394 n) (/ (A269172 (* 3 n)) 3))
%Y Inverse: A269393.
%Y Cf. A269172, A269396.
%K nonn
%O 1,2
%A _Antti Karttunen_, Mar 03 2016